Disclosed is an improved three-phase direct-current (DC) brushless motor with hall elements, in which two hall elements instead of three hall elements are placed upon the driving circuit of the DC brushless motor to sense the variation of the magnetic flux during the operation so as to reduce the manufacturing cost and also improve the operation precision.
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1. An improved three-phase direct-current (DC) brushless motor with hall elements, comprising:
a driving circuit for driving said brushless motor; and a first hall element and a second hall element placed upon said driving circuit so as to sense the variation of the magnetic flux during the operation of said DC brushless motor and output a third voltage induced by the variation of the magnetic flux to said driving circuit, to control said DC brushless motor by the induced voltage, wherein the potential difference of a positive potential of said first hall element and a negative potential of said second hall element is the third voltage.
2. The improved three-phase DC brushless motor as recited in
3. The improved three-phase DC brushless motor as recited in
4. The improved three-phase DC brushless motor as recited in
5. The improved three-phase DC brushless motor as recited in
6. The improved three-phase DC brushless motor as recited in
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1. Field of the Invention
The present invention generally relates to an improved three-phase direct-current (DC) brushless motor with Hall elements, and more particularly, to a three-phase DC brushless motor in which the required voltage for the driving circuit is obtained by use of suitable arrangement of the Hall elements with the circuit.
2. Description of the Prior Art
The structure of a DC brushless motor is different from that of a typical DC motor in that the former is the inside-out design of the latter. In an "inside-out" design of a DC brushless motor, the rotating portion, i.e., the rotor, is on the outside of the stator. The stationary portion, i.e., stator, is formed by the inside of the machine and is inserted down the axis of the dipole field. The cylindrical rotor contains an array of identical permanent magnets that provide a uniform dipole field. The windings of the motor are placed in or on the stator. The stator windings are then "switched" or "commutated" to provide a DC motor/generator much the same as in a conventional DC motor.
The operation mode of a DC brushless motor is also different from that of a typical DC motor in that the commutation of the former can be performed by electronic means using switching circuits and the latter by mechanical means using brushes. Therefore, the undesired problems related to mechanical structure can be overcome by replacing the mechanical means with electronic means such as power semiconductor devices or ICs for signal processing so as to control the three-phase current of the DC motor and achieve better operation characteristics.
Please refer to
As mentioned above, it is known that in the prior art three Hall elements are utilized to complete the operation of a DC brushless motor. However, there is a need for improved precision and manufacturing cost. In order to meet the requirement for higher precision and lower manufacturing cost, a better design for improvement has been proposed.
It is therefore the primary object of the present invention to provide an improved three-phase direct-current (DC) brushless motor with Hall elements, in which two Hall elements instead of three Hall elements are used to sense the variation of the magnetic flux during the operation of the DC brushless motor so as to reduce the manufacturing cost and also improve the efficiency of the motor.
To accomplish the foregoing object, the present invention provides an improved three-phase DC brushless motor utilizing two Hall elements placed upon the driving circuit so as to sense the variation of the magnetic flux during the operation of the DC brushless motor and output a voltage induced by the variation of the magnetic flux to the driving circuit, wherein the driving circuit controls the DC brushless motor by the induced voltage.
It is preferable that a third voltage required for the driving circuit to control the DC brushless motor is obtained by sampling and processing the voltages induced respectively by the two Hall elements.
It is preferable that the two Hall elements are placed upon the driving circuit and the arrangement of the Hall elements forms a angle with respect to the rotor inside the DC brushless motor.
The objects, spirits and advantages of the preferred embodiment of the present invention will be readily understood by the accompanying drawings and detailed descriptions, wherein:
The present invention provides an improved three-phase DC brushless motor with Hall elements, in which two Hall elements instead of three Hall elements are placed upon the driving circuit of the DC brushless motor to sense the variation of the magnetic flux during the operation so as to reduce the manufacturing cost and also improve the operation precision.
Please refer to
The voltages VA, VB are generated respectively by said Hall element IV 31 and said Hall element V 32 induced by the external sinusoidal magnetic field. The can be obtained by the following relations.
wherein K is a constant, I represents the input current into the Hall elements, and B represents the peak value of the magnetic flux density. Therefore, the induced voltage VA is obtained by the product of a constant K, I (the input current into the Hall element I), and the magnetic flux density B sensed by the Hall element I. Similarly, the induced voltage VB is obtained by the product of a constant K, I (the input current into the Hall element II), and the magnetic flux density B sensed by the Hall element II. Furthermore, a third voltage VC can be obtained by using the following equation:
or
wherein VC=KIBsin(wt+360°C)
and
By applying to the processing circuit, the third induced voltage VC can be obtained with Hall element IV and Hall element V placed upon the driving circuit. In other words, the third induced voltage VC is obtained by the potential difference of the positive potential of said first Hall element and the negative potential of said second Hall element is the third phase voltage. The positive potential of the induced voltage of said first Hall element is processed into the negative potential of the third phase voltage, and the negative potential of the induced voltage of said second Hall element is processed into the positive potential of the third phase voltage.
Please refer to
As seen in
As discussed so far, in accordance with the present invention, there is provided an improved three-phase DC brushless motor with Hall elements, in which two Hall elements instead of three Hall elements are placed upon the driving circuit of the DC brushless motor to sense the variation of the magnetic flux during the operation so as to reduce the manufacturing cost and also improve the operation precision. Consequently, the present invention has been examined to be progressive and has great potential in commercial applications.
Although this invention has been disclosed and illustrated with reference to particular embodiments, the principles involved are susceptible for use in numerous other embodiments that will be apparent to persons skilled in the art. This invention is, therefore, to be limited only as indicated by the scope of the appended claims.
Huang, Shih-Ming, Chiu, Hsien-Lin
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Oct 12 2000 | CHIU, HSIEN-LIN | DELTA ELECTRONICS INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011431 | /0472 | |
Oct 12 2000 | HUANG, SHIH-MING | DELTA ELECTRONICS INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011431 | /0472 | |
Nov 03 2000 | Delta Electronics Inc. | (assignment on the face of the patent) | / |
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